The patch titled
Subject: mm: do not show fs mm pc for VM_LOCKONFAULT pages
has been added to the -mm mm-unstable branch. Its filename is
mm-do-not-show-for-vm_lockonfault-pages.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-do-not-show-for-vm_lockonfault-pages.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: "Jason A. Donenfeld" <Jason@xxxxxxxxx>
Subject: mm: do not show fs mm pc for VM_LOCKONFAULT pages
Date: Mon, 5 Dec 2022 18:30:07 +0100
When VM_LOCKONFAULT was added, /proc/PID/smaps wasn't hooked up to it, so
looking at /proc/PID/smaps, it shows '??' instead of something
intelligable. This can be reached by userspace by simply calling
`mlock2(..., MLOCK_ONFAULT);`.
Fix this by adding "lf" to denote VM_LOCKONFAULT.
Link: https://lkml.kernel.org/r/20221205173007.580210-1-Jason@xxxxxxxxx
Fixes: de60f5f10c58 ("mm: introduce VM_LOCKONFAULT")
Signed-off-by: Jason A. Donenfeld <Jason@xxxxxxxxx>
Cc: Eric B Munson <emunson@xxxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/proc/task_mmu.c | 1 +
1 file changed, 1 insertion(+)
--- a/fs/proc/task_mmu.c~mm-do-not-show-for-vm_lockonfault-pages
+++ a/fs/proc/task_mmu.c
@@ -674,6 +674,7 @@ static void show_smap_vma_flags(struct s
[ilog2(VM_RAND_READ)] = "rr",
[ilog2(VM_DONTCOPY)] = "dc",
[ilog2(VM_DONTEXPAND)] = "de",
+ [ilog2(VM_LOCKONFAULT)] = "lf",
[ilog2(VM_ACCOUNT)] = "ac",
[ilog2(VM_NORESERVE)] = "nr",
[ilog2(VM_HUGETLB)] = "ht",
_
Patches currently in -mm which might be from Jason@xxxxxxxxx are
mm-do-not-bug_on-missing-brk-mapping-because-userspace-can-unmap-it.patch
mm-do-not-show-for-vm_lockonfault-pages.patch
